Just think of this--the only cooling air going to the rear engine comes in thru the scoop on top of the cabin. The only way that air flows into that is to be pushed by the front prop, or air/ground speed. The rear prop doesn't suck enough air to flow around the cylinder cooling fins. You could be damaging the engine by localized heating that is not read on instruments on the panel.
Taxiing in with the front engine running is no more dangerous than taxiing in in a 182 or a 210.
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